While none of the routes winding up and between the four glacial cirques on Mount Katahdin’s flanks are secrets, you’ll find the fewest people on the Abol Trail. It’s the most challenging, naturally, so bring your scrambling skills for the Abol Slide (slabs and talus exposed after a 19th century avalanche), and strong quads for the 4,000 feet of elevation gain. Map includes turn-by-turn hiking directions and in-depth trip planning essentials to help you experience this BACKPACKER PRO adventure.